Which system of linear equations has the same solution as the one shown below? x - 4y= - 10 x + y = 5 1) 5x = 10 x + y = 5 2) -5y = -5 x+y=5 3)-3x = - 30 x + y = 5 4)-5y = -5 x - 4y = -10​

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

The manufacturer of a new product developed the following expression to predict the monthly profit, in thousands of dollars, from sales of the productwhen it is sold at a unit price of x dollars.-0.5x^2 + 22x - 224what is represented by the zero(s) of the expression? a.the profit when the unit price is equal to 0b.the unit price(s) when the profit is equal to 0c.the profit when the unit price is greatestd.the unit price(s) when profit is greatest

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil